Electric switch



No. 6l7,|93. P'atantcd Jan. 3, I899. 0. H. SGHUCK.

ELECTRIC SWITCH.

(Application fllod July 2, 1898.)

(No Model.)

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UNITED STATES PATENT OFFICE.

OSCAR ll. SOIIUOK, OF PHILADELPHIA, PENNSYLVANIA.

ELECTRIC SWITCH.

SPECIFICATION forming part of Letters Patent No. 617,193, dated January3, 1899.

Application filed July 2, 1898. Serial No. 685,053. (No model.)

"To all whom, it may concern:

Be it known that I, OSCAR ll. SCHUCK, of Philadelphia, in the county ofPhiladelphia and State of Pennsylvania, have invented a new and ImprovedElectric Switch, of which the following is a full, clear, and exactdescription.

This invention relates to switches used in connection with analarm-circuit controlled by the opening and closing of a door. In theordinary arrangement of door alarms in dwellings, stores, factories, andstables there is a switch in the circuit near the door which may beturned to open the circuit when it is desired thatthe door shall remainopen fora considerable length of time, and thus prevent the bell fromringing. It sometimes happens that such switch is by carelessness leftopen when the door is closed, thus making the alarm inoperative.

The object of myinvention is to provide a switch thatshould it be openedwill be auto- Y matically closed upon the closing of a door,

and, further, to so construct it that it cannot be opened and leftopenedwhen the door is closed.

I will describe an electric switch embodying my invention and then pointout the novel features in the appended claims.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar characters of reference indicatecorresponding parts in all the views.

Figure 1 is an elevation of a switch embodying my invention, showing itas closed and in an alarm-circuit. Fig. 2 is an elevation showing theswitch as open, and Fig 3 is a section on the line 3 3 of Fig. 2.

The switch is designed to be secured to a door or to a door-jamb. I havehere shown it as attached to a jamb m for a door y. The switch-arm 1 ismounted to swing on a base 2, and it is held yieldingly and normally incontact with brushes 3 on the base by means of a spring 4, connected atone end to the switch-arm and at the other end to the base end 6 and thebase 2 a spring 7. The end of.

the switch-arm l is provided with a lug 8, designed to engage at acertain time with a lug 9 on the plate The ing 9 is beveled or inclinedon the side toward the switch-arm 1.

The switch-arm 1 has connection with a cirg cuit-wire 10, leading to analarm 11, and from which alarm the circuit-wire 12 leads to thecontact-brushes 3. In this circuit (here shown as in the wire 12) isplaced a battery 13, and also placed in this wire 12 is a switch 1 t,designed to be opened in the ordinary manner when the door is closed andto be moved to its closing position by means of a spring 15 when thedoor is opened.

In operation while the door is closed and bearing upon the end of theplate 5 the said plate will be held in such position as to allow theswitch-arm to be swung without engaging with the lug 9. Therefore uponreleasing the switch-arm it will be immediately moved to itscircuit-closing position by means of its spring. When the door isopened, the switch 14; will move to its closing position, thus closingthe circuit and causing the alarm to sound, and the opening of the doorwill allow the plate 5 to be moved outward by means of the spring 7, andwhen in this outward position the lug 9 will be in theliue of movementwith the lug 8 on the switch-arm. Therefore should it be desired to cutout the alarm while the door is to remain open for a considerable lengthof time the switch-arm is to be swung until its lug 8 passes over andagainst the rear side of the lug 9, the resiliency of the arm allowingit to pass over said lug 9. Upon closing the door it will move the plate5 inward, and this inward movement of the plate will release the lug 9from the lug 8, allowing the spring a to return the switch-arm to itscircuit-closing position. Thus it will be seen that it is impossible toleave the switcharm open when the door is closed. Of course upon closingthe door the circuit will be broken by the opening movement of theswitch 14:.

Having thus described my invention, I claim as new and desire to secureby Letters Patent- 1. An alarm, comprising an electric circuit, aswinging switch-arm in the circuit, a contact-brush in the circuit andwith which the arm normally engages, a sliding plate adapted to hold theswitch-arm in its open position, and arranged to be moved to release thearm,

and a lug on said plate, with which the lug IO on the arm is designed toengage to hold the switch-arm in its open position, substantially asspecified.

OSCAR II. SOllU CK.

\Vitnesses:

WM. KNIGHT SHRYOCK, LoUIs F, ScHUcK.

